I am trying to destring a variable to one decimal numerical variable

but when I run this command: destring weight , gen (weight1)

I get this error "weight: : contains nonnumeric characters; no generate"


Help please. Thanks in advance.

Code:
*Example generated by -dataex-. To install: ssc install dataex
clear
input str10 weight
"12.6"
"14.0"
"12.7"
"11.90"
"12"  
"13.1"
"13.6"
"14.31"
"15.1"
"13.2"
"13.90"
"13.6"
"15.5"
"14.5"
"13.8"